What is a frequent precursor to squamous cell carcinoma and how does it typically present on histo?
a) Actinic keratosis; dysplastic cells with hyperchromatic nuclei
b) Seborrheic keratosis; keratin pearls and intercellular bridges
c) Acanthosis nigricans; epidermal hyperplasia
d) Basal cell carcinoma; palisading nuclei
